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[2. 5. CLEMENT.-

ACOUSTIC APPARATUS.

A-FPLICATION. FILED FEB- 19, 1917- 1 306,248.. Patented June 10, A919,

Y tlng apparatus and particularly -to te1e'-' UN ED STATES .JPATEN; H T OFFICE? Y swim) a m me, or WASHINGTON, nisrmo'r' or cone-item.

' ACOUSTIC urnnnrus,

. specificatic l gjetters Patent.

atented J ie, 1919.

orig inal lanplicationi m l Ka rch 1c, 1912, Serial No. 683615; (Pate nt in. 1','2:1;m,: dated lj'ehrnalfy so,

- 1917.) Divided and this application med .retz j 19, 1917. serial n; 149,059.

' Be it known that I, EowAnn a citizen of the United States, residin at.-

Washington, in the District of 'Col um ia, have invented certainjnew and useful Improvements' in Acoustic-Apparatus, of which the following is a speeification, reference behad therein to the accompanyinglimy I y invention iela is to sound-transmitphonic relays;

jduce. a relay which will cifjectively-t reinforce and increase-{the volume of transmitted. sound vibrations, Without distortion or 'loss of'sharpness: invention depends 18 that expressed in Pas caIs-law. As the. principle is appliedflhe resistance 'jtransmitter' having an area or areas suitably proportioned relatively to the saidunit aree toinitial vibrations received through the -pri-- mary circuit are ,area, and the pressurei wav'es' produced in the; liquid --arev the eausedltojact upon a 'fdiaphraginor ,diaph 'a'gins ,of a variable body of inay be i invention is illustrated in the-accompanyingdrawings in which Figure 1 is a sectional yiew of a telephonic relayTem-i bodyingmyinvention, andFig. 2-is a'detail section showing the addition o';f. an air.

I i-Fig. :1 1 represents anelectroinag'netic lliniting;'that is to. anmcoming'circuit, v v.

ing: circuit 2 which may he; telephonic or telegraphic) B-iridiates a variable resist anoe granular transmitter havingjuxtapois'ed a electrodes, connected in'a transmitting cirjet circuit or 'an outgoing buttons 7 or has-its dia me'ntS 'to be connected in; series or The principle upon which this to increase the resistance or respectively;

, electromagnetically trans- .lated into mechanical- Vibnations'and, com; --munieated to a body ofJiquidover a limit 7' produce the desired effect. I For cushioning purposes, in some cases a gas onai'r preferably under pressure t employed as a part-of the'tran's1nit-- =t1n medium.

hisjappiicatidn is a division of'iny prior 7 splication-filed March 16, 1912', Serial N o; ,365, 1 upon which Letters Patent No; 1,216,946,:Were granted tome February 20,'

electrical v1 receiver. c'ionnected with a primary 'orljrec'eivs i two compartments, transmitt' in one of said" compartments, means'for [pressure in the other and the circuit .4: ma be for -the.-. circuits, it is f sel containing liquid the electromagnet -l and' ot v 9, each connected to one electrodeof the transmitter. v microphone elements, andeach transmitting: circuit orithe. 5v res; f6; t jv l being Y .shOWn: as entirely c1os ed,- rovided} Withediaphragm 7 connected to t e armature 8 of er. diaphragmsfiio In the relay shownare 'two hi-agm 9 exposed to the liquid: I There mayge one or many of these elements diaphragrns. 1 It is preferable, however, It has for-itsjobject to..p]rothe diiferent microphones or transmitter e1e-.

parallel,

p the conductivity, i and at the same time affords certain. advantages of at-large diaphragm i without increasing'thefinertia Fig. 2 showsan airspace 1O interposed between the diaphragm mental 1diaphragm-ai exposed to the liquid, the idea] being to cushion-the vibrations. This cushion may. be

. Having thus des claim. and

7 and iasupple-.j

placed between either 20f thef-i ibratory-elem'ents 0'1" Cliaphragms and .i'tscorrespondi-ng element.-v

cribed my invention" what desire to secure by Letters primary diaphragm arranged to respon to ra ion v I ha" plurality ."of independently Vibrating {means in axhelectrical'drcuit, and liquidv secondaryrdiaphragms arranged to actuate "currentcontrolling 1 transmitting vmeans 'connecting said die:

phragms, said 's'econdary diaphragms hav-, ing an aggregate areafgreatei than that of thepri nary diaphragm and each, capable of responding to a frequency higherthan "that to which a diaphragm of the aggregatearea' could. respond. t v 2. Sound conveying means 'com'prising'a fluid bontaine f, a plurality of dia hragms forming part of the walls of said uid confirst mentioneding diaphragms to divi liquid loo tainer; a partitioning diaphragm in said "container. interposed between onev of, said diaphr'afms andv the remaim c said container v of saidcompartments." 3. A telephonic relay cornprisin" an e1'ec-, troniagnetic re0eivingelement an a variable resistance transmitting element, with n vessel containing them, I sound v brations through the 1i 5 inent to thetransmitting element; a

to the .electronmgnetie .phragm connected elementand adapte being transmitted the receiving eleiafrom d to act upon said liquid liquid interconneetmg and another diaphrag transmitting element acted upon by the liqu m connected to said and adapted to be id, together with a 1'0 

